Python program to convert decimal to binary

In this tutorial, we are going to see how to write a programs to convert a decimal number into an equivalent binary number. We will see two Python programs, the first program performs the conversion using a user-defined function and in the second program, we use a built-in function called bin() for decimal to binary conversion.
 

Python program to convert decimal to binary using a recursive function

In this program, we have defined the function decToBin(). This function takes the decimal number as an input parameter and converts it to an equivalent binary number.
 
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def decToBin(n):
    if n > 1:
        decToBin(n // 2)
    print(n % 2, end='')


# Asks the user to enter a number
nbr = int(input("Enter a decimal number: "))

decToBin(nbr)

Output:

Enter a decimal number: 9
1001

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Python program to convert decimal to binary using bin() function

In this program, we use a built-in function called bin() to convert the decimal number to binary.

# Asks the user to enter a number
nbr = int(input("Enter a decimal number: "))

# Print the binary number
print("Equivalent binary number: ", bin(nbr))

Output:

Enter a decimal number: 9
Equivalent binary number:  0b1001

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